2018-03-19T15:06:38ZModelo sencillo para el estudio de los parámetros de entrada de una antena fractal de Sierpinskihttp://hdl.handle.net/2117/106785
Modelo sencillo para el estudio de los parámetros de entrada de una antena fractal de Sierpinski
Borja Borau, Carmen; Puente Baliarda, Carles; Medina Sierra, Agustín; Romeu Robert, Jordi; Pous Andrés, Rafael
2017-07-25T08:53:59ZBorja Borau, CarmenPuente Baliarda, CarlesMedina Sierra, AgustínRomeu Robert, JordiPous Andrés, RafaelExperimental studies on 3D impulse waves generated by rapid landslides and debris flowshttp://hdl.handle.net/2117/27188
Experimental studies on 3D impulse waves generated by rapid landslides and debris flows
Bregoli, Francesco; Bateman Pinzón, Allen; Medina Iglesias, Vicente César de; Gómez Cortés, Diego
The input of material in a water body at high velocity, like a landslide or a debris flow, can induce a big, abnormal wave, known as impulse wave or landslide tsunami wave. Once the wave is triggered, the effects on the shorelines are devastating and moreover unlikely predicted. Disastrous past events have been extensively analysed but remain too scarce to properly describe the process. Experiments of impulse waves have been carried out by various authors. The present work was planned to fill the lack of experimental data on the effect of granular material falling in a water basin, exploring new ranges of parameters governing this process.
It is introduced a new experimental set up installed in the fluvial-morphodynamic laboratory of the GITS team in the Technical University of Catalonia. The experimental device consists of a wheeled box sliding on a steeply sloped flume and releasing granular material, which ends up in a basin. The system allows reaching a relatively high velocity of the granular mass for a correct simulation of the process’s behaviour.
A system has been defined in order to be able to measure the velocity of the granular material and its depth, as well as the propagation of the waves, with high-speed cameras and a laser grid system. The dynamic forces of the granular mass’ impact on different surfaces is also measured and related to the studied phenomenon.
Several experiments’ runs have been carried out. First results are here presented and analysed.
2015-04-08T17:12:07ZBregoli, FrancescoBateman Pinzón, AllenMedina Iglesias, Vicente César deGómez Cortés, DiegoThe input of material in a water body at high velocity, like a landslide or a debris flow, can induce a big, abnormal wave, known as impulse wave or landslide tsunami wave. Once the wave is triggered, the effects on the shorelines are devastating and moreover unlikely predicted. Disastrous past events have been extensively analysed but remain too scarce to properly describe the process. Experiments of impulse waves have been carried out by various authors. The present work was planned to fill the lack of experimental data on the effect of granular material falling in a water basin, exploring new ranges of parameters governing this process.
It is introduced a new experimental set up installed in the fluvial-morphodynamic laboratory of the GITS team in the Technical University of Catalonia. The experimental device consists of a wheeled box sliding on a steeply sloped flume and releasing granular material, which ends up in a basin. The system allows reaching a relatively high velocity of the granular mass for a correct simulation of the process’s behaviour.
A system has been defined in order to be able to measure the velocity of the granular material and its depth, as well as the propagation of the waves, with high-speed cameras and a laser grid system. The dynamic forces of the granular mass’ impact on different surfaces is also measured and related to the studied phenomenon.
Several experiments’ runs have been carried out. First results are here presented and analysed.Desarrollo de herramientas para la evaluación preliminar de la peligrosidad de corrientes detríticashttp://hdl.handle.net/2117/19291
Desarrollo de herramientas para la evaluación preliminar de la peligrosidad de corrientes detríticas
Bregoli, Francesco; Bateman Pinzón, Allen; Medina Iglesias, Vicente César de; Hurlimann Ziegler, Marcel
Con el objetivo de proporcionar recomendaciones para la alerta temprana de fenómenos potencialmente desencadenantes de corrientes detríticas (“Debris Flow”), uno de los temas principales es la identificación preliminar de zonas de riesgo. Esta identificación es sustancialmente
diferente de los mapas de riesgo que se suelen realizar por las autoridades de cuenca con el fin de dar una guía para planes de gestión del territorio. En el caso de alerta temprana, una identificación
más aproximativa de las zonas de riesgo es suficiente. En esta perspectiva, los dos componentes del riesgo, peligrosidad y vulnerabilidad, se pueden estimar de una manera simplificada.
En este trabajo se han desarrollado unas herramientas para la evaluación rápida de peligro por corrientes detríticas. Se han adaptado metodologías existentes y modelos simplificados y se ha llevado a cabo un útil paquete común de metodologías para una rápida evaluación de la peligrosidad. Se modelan tanto la iniciación como la propagación de corrientes detríticas. Uno de
los requisitos del proyecto es definir una herramienta utilizable en diferentes contextos donde el nivel de detalle en los datos de entrada puede ser muy variado. Para lograr este objetivo se define un enfoque multinivel. La metodología se aplica en tres cuencas con características diferentes.
2013-05-16T12:17:48ZBregoli, FrancescoBateman Pinzón, AllenMedina Iglesias, Vicente César deHurlimann Ziegler, MarcelCon el objetivo de proporcionar recomendaciones para la alerta temprana de fenómenos potencialmente desencadenantes de corrientes detríticas (“Debris Flow”), uno de los temas principales es la identificación preliminar de zonas de riesgo. Esta identificación es sustancialmente
diferente de los mapas de riesgo que se suelen realizar por las autoridades de cuenca con el fin de dar una guía para planes de gestión del territorio. En el caso de alerta temprana, una identificación
más aproximativa de las zonas de riesgo es suficiente. En esta perspectiva, los dos componentes del riesgo, peligrosidad y vulnerabilidad, se pueden estimar de una manera simplificada.
En este trabajo se han desarrollado unas herramientas para la evaluación rápida de peligro por corrientes detríticas. Se han adaptado metodologías existentes y modelos simplificados y se ha llevado a cabo un útil paquete común de metodologías para una rápida evaluación de la peligrosidad. Se modelan tanto la iniciación como la propagación de corrientes detríticas. Uno de
los requisitos del proyecto es definir una herramienta utilizable en diferentes contextos donde el nivel de detalle en los datos de entrada puede ser muy variado. Para lograr este objetivo se define un enfoque multinivel. La metodología se aplica en tres cuencas con características diferentes.High-speed debris-flows generating 2D impulse waves: Experimental analysishttp://hdl.handle.net/2117/19255
High-speed debris-flows generating 2D impulse waves: Experimental analysis
Bregoli, Francesco; Bateman Pinzón, Allen; Medina Iglesias, Vicente César de
When a landslide or a debris-flow falls in a water body, a big wave, known as impulse wave or
landslide tsunami wave, can be generated. That phenomenon can be highly destructive and unlikely predicted,
involving dams and shorelines. Disastrous past events have been extensively analyzed and experimental studies have been carried out by different authors, but do not fully account for the description of the phenomenon. In the present study we introduce a new experimental set up installed in the fluvial-morphodynamic laboratory of the GITS team in the Technical University of Catalonia. The experimental device consists of a wheeled box
sliding on a steep slope flume, releasing granular material, which enters a 2D basin. Defining a set of governing parameters and after several run of experiment, a description of the behavior of the waves was attempted. First results are here presented and analyzed.
2013-05-15T14:03:26ZBregoli, FrancescoBateman Pinzón, AllenMedina Iglesias, Vicente César deWhen a landslide or a debris-flow falls in a water body, a big wave, known as impulse wave or
landslide tsunami wave, can be generated. That phenomenon can be highly destructive and unlikely predicted,
involving dams and shorelines. Disastrous past events have been extensively analyzed and experimental studies have been carried out by different authors, but do not fully account for the description of the phenomenon. In the present study we introduce a new experimental set up installed in the fluvial-morphodynamic laboratory of the GITS team in the Technical University of Catalonia. The experimental device consists of a wheeled box
sliding on a steep slope flume, releasing granular material, which enters a 2D basin. Defining a set of governing parameters and after several run of experiment, a description of the behavior of the waves was attempted. First results are here presented and analyzed.Setup of an experimental device for high-speed debris flows generating 2D impulse waveshttp://hdl.handle.net/2117/18074
Setup of an experimental device for high-speed debris flows generating 2D impulse waves
Bateman Pinzón, Allen; Bregoli, Francesco; Medina Iglesias, Vicente César de; Rast, Manuel; Bentz, Clara
Landslides and debris flows falling into reservoirs, natural lakes, fjords or seas can generate impulse waves, which can be assimilated to tsunami-water waves. Such wave’s behavior can be highly destructive regarding dams and other structures and infrastructures as well as people living along shorelines. Destructive observed past events, such Vajont Dam in Italy (1963) or Lituya Bay in Alaska (1958), are not enough to describe and finally properly prevent the phenomenon. Experimental studies on the topic have been carried out in one-dimensional (1D) and two-dimensional (2D) water basins with a sliding block or sliding granular material. Due to the lack of studies on the effect of granular material falling in a 2D basin and to explore new ranges of governing parameters of experiments, the present research work is being carried out. In the Fluvial-Morphodynamics Laboratory of GITS in the Technical University of Catalonia, a facility to study that phenomenon is set up. The whole project was founded through the project “Debris Flow” (CGL 2009-13039) by the Spanish Ministry of Science and Technology. The system consists of a steep slope flume releasing granular material in a two dimensional basin. The main drawback was to develop a system able to reach high speed mass movement which was achieved building a metallic wheeled box, sliding in rails with a very low roughness. The second issue was to define a system able to measure the velocity of the granular material and its depth, solved processing images of a high speed camera. Finally a grid on the water surface, done by laser sheets, was set. The water surface being filmed and the resulting images successively processed, the produced wave can be measured. All the measurement systems are designed to not distort the process. First results relative on a first set of experiments are presented and preliminary discussed.
2013-03-05T14:58:23ZBateman Pinzón, AllenBregoli, FrancescoMedina Iglesias, Vicente César deRast, ManuelBentz, ClaraLandslides and debris flows falling into reservoirs, natural lakes, fjords or seas can generate impulse waves, which can be assimilated to tsunami-water waves. Such wave’s behavior can be highly destructive regarding dams and other structures and infrastructures as well as people living along shorelines. Destructive observed past events, such Vajont Dam in Italy (1963) or Lituya Bay in Alaska (1958), are not enough to describe and finally properly prevent the phenomenon. Experimental studies on the topic have been carried out in one-dimensional (1D) and two-dimensional (2D) water basins with a sliding block or sliding granular material. Due to the lack of studies on the effect of granular material falling in a 2D basin and to explore new ranges of governing parameters of experiments, the present research work is being carried out. In the Fluvial-Morphodynamics Laboratory of GITS in the Technical University of Catalonia, a facility to study that phenomenon is set up. The whole project was founded through the project “Debris Flow” (CGL 2009-13039) by the Spanish Ministry of Science and Technology. The system consists of a steep slope flume releasing granular material in a two dimensional basin. The main drawback was to develop a system able to reach high speed mass movement which was achieved building a metallic wheeled box, sliding in rails with a very low roughness. The second issue was to define a system able to measure the velocity of the granular material and its depth, solved processing images of a high speed camera. Finally a grid on the water surface, done by laser sheets, was set. The water surface being filmed and the resulting images successively processed, the produced wave can be measured. All the measurement systems are designed to not distort the process. First results relative on a first set of experiments are presented and preliminary discussed.Simulación numérica del flujo de un tramo fluvial con una turbina de paso situada en su lecho y los efectos en el comportamiento de su lámina librehttp://hdl.handle.net/2117/17399
Simulación numérica del flujo de un tramo fluvial con una turbina de paso situada en su lecho y los efectos en el comportamiento de su lámina libre
Oller Aramayo, Sergio A.; Bateman Pinzón, Allen; Nallim, Liz; Oller Martínez, Sergio Horacio
Las turbinas de paso o WCT (Water Current Turbines) abren nuevas y mayores posibilidades, con grandes ventajas en cuanto al aprovechamiento hidroeléctrico. Éstas evitan las construcciones de costosas presas y reducen considerablemente el impacto medioambiental que producen otras soluciones de aprovechamiento energético. Pero a su vez esta solución plantea una
serie de nuevos retos tecnológicos, debido a sus diseños sin todavía ningún tipo de estandarización y pocos antecedentes en su utilización. Además, a todo esto hay que agregar la complejidad que añade el estudio del comportamiento del flujo del río donde deben instalarse. El modelo que se analiza en el presente trabajo representa un tramo fluvial con una turbina de paso axial situada en su lecho. Dicho modelo se analiza mediante la técnica de simulación numérica CFD (Computational Fluid Dynamics) y la turbina de paso se representa introduciendo en el cauce del río un bloque constituido por un medio continuo poroso para representar las perturbaciones que esta
introduce y sus intercambios energéticos con el flujo del cauce. En este artículo se analizan las velocidades alcanzadas en las distintas zonas del río, presiones, líneas de corriente, y el comportamiento de la lámina libre que resulte de la presencia de la turbina representada a través de un bloque de medio poroso. Con este trabajo se estudia un eslabón importante en la cadena de desarrollos necesarios para el diseño y factibilidad de aplicación y puesta en marcha de una turbina de paso que está actualmente en desarrollo por los autores. (Oller et al., Revista Iberoamericana de Ingeniería Mecánica, Vol.16 Nº1 pp. 03-16 (2012)).
2013-01-17T13:48:28ZOller Aramayo, Sergio A.Bateman Pinzón, AllenNallim, LizOller Martínez, Sergio HoracioLas turbinas de paso o WCT (Water Current Turbines) abren nuevas y mayores posibilidades, con grandes ventajas en cuanto al aprovechamiento hidroeléctrico. Éstas evitan las construcciones de costosas presas y reducen considerablemente el impacto medioambiental que producen otras soluciones de aprovechamiento energético. Pero a su vez esta solución plantea una
serie de nuevos retos tecnológicos, debido a sus diseños sin todavía ningún tipo de estandarización y pocos antecedentes en su utilización. Además, a todo esto hay que agregar la complejidad que añade el estudio del comportamiento del flujo del río donde deben instalarse. El modelo que se analiza en el presente trabajo representa un tramo fluvial con una turbina de paso axial situada en su lecho. Dicho modelo se analiza mediante la técnica de simulación numérica CFD (Computational Fluid Dynamics) y la turbina de paso se representa introduciendo en el cauce del río un bloque constituido por un medio continuo poroso para representar las perturbaciones que esta
introduce y sus intercambios energéticos con el flujo del cauce. En este artículo se analizan las velocidades alcanzadas en las distintas zonas del río, presiones, líneas de corriente, y el comportamiento de la lámina libre que resulte de la presencia de la turbina representada a través de un bloque de medio poroso. Con este trabajo se estudia un eslabón importante en la cadena de desarrollos necesarios para el diseño y factibilidad de aplicación y puesta en marcha de una turbina de paso que está actualmente en desarrollo por los autores. (Oller et al., Revista Iberoamericana de Ingeniería Mecánica, Vol.16 Nº1 pp. 03-16 (2012)).Flow structure and resistance in flexible vegetated channelshttp://hdl.handle.net/2117/15630
Flow structure and resistance in flexible vegetated channels
Velasco Montes, David; Bateman Pinzón, Allen; Redondo Apraiz, José Manuel
The present paper helps to understand the behaviour of the flow through plants, as a
first approximation to the environmental interactions happening in natural rivers.
2012-03-21T10:34:48ZVelasco Montes, DavidBateman Pinzón, AllenRedondo Apraiz, José ManuelThe present paper helps to understand the behaviour of the flow through plants, as a
first approximation to the environmental interactions happening in natural rivers.Numerical analysis of MHD-thermofluid flows considering sandwich structures as applied to liquid breeding blankets for fusion technologyhttp://hdl.handle.net/2117/15199
Numerical analysis of MHD-thermofluid flows considering sandwich structures as applied to liquid breeding blankets for fusion technology
Mas de les Valls Ortiz, Elisabet; Batet Miracle, Lluís; Medina Iglesias, Vicente César de; Fradera, Jordi; Sedano, L.A.
Lead lithium flowing inside breeding blanket’s channels in a fusion reactor is subject to a Hartmann
number of 104 and a Grashof number 109􀀀12. Since under such conditions buoyancy
can be of the same order of magnitude as the electromagnetic force, a deep understanding of
the coupled phenomena is required. In the present study, a horizontal channel with dimensions,
mean velocity and thermal load taken from HCLL blanket design, and considering a Hartmann
number of 3000, is analysed using di erent thermal strategies. The unstable nature of the resulting
flow is studied, as well as its influence on relevant thermal parameters.
2012-02-17T10:23:06ZMas de les Valls Ortiz, ElisabetBatet Miracle, LluísMedina Iglesias, Vicente César deFradera, JordiSedano, L.A.Lead lithium flowing inside breeding blanket’s channels in a fusion reactor is subject to a Hartmann
number of 104 and a Grashof number 109􀀀12. Since under such conditions buoyancy
can be of the same order of magnitude as the electromagnetic force, a deep understanding of
the coupled phenomena is required. In the present study, a horizontal channel with dimensions,
mean velocity and thermal load taken from HCLL blanket design, and considering a Hartmann
number of 3000, is analysed using di erent thermal strategies. The unstable nature of the resulting
flow is studied, as well as its influence on relevant thermal parameters.Development of preliminary assessment tools to evaluate debris flow riskshttp://hdl.handle.net/2117/10802
Development of preliminary assessment tools to evaluate debris flow risks
Bregoli, Francesco; Ciervo, F.; Medina Iglesias, Vicente César de; Bateman Pinzón, Allen; Hurlimann Ziegler, Marcel; Chevalier, Guillaume Gerard; Papa, M.
In the framework of the IMPRINTS European Research Project (FP7), a toolbox for fast assessment of debris flow hazard has been developed. The aim of this toolbox is to
implement different existing models inside a common package useful for a fast evaluation of potential hazard. The initiation and propagation of the debris flow is included. One of the requirements of the projects is to define different scenarios with different detail levels in data input. As an example of this, the results could be obtained just using topographical data or improve accuracy by adding geological and hydrological data.
2010-12-28T19:31:33ZBregoli, FrancescoCiervo, F.Medina Iglesias, Vicente César deBateman Pinzón, AllenHurlimann Ziegler, MarcelChevalier, Guillaume GerardPapa, M.In the framework of the IMPRINTS European Research Project (FP7), a toolbox for fast assessment of debris flow hazard has been developed. The aim of this toolbox is to
implement different existing models inside a common package useful for a fast evaluation of potential hazard. The initiation and propagation of the debris flow is included. One of the requirements of the projects is to define different scenarios with different detail levels in data input. As an example of this, the results could be obtained just using topographical data or improve accuracy by adding geological and hydrological data.